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Formula

Average pace (min/km) = Finish time (min) ÷ Distance (km)

Average speed (km/h) = Distance (km) ÷ (Finish time (min) ÷ 60)

Where:

• t = finish time in minutes
• d = distance in kilometers
• pace = minutes per kilometer (lower is faster)
• speed = kilometers per hour (higher is faster)

Worked Example

Using the default values: t = 50 minutes, d = 10 km.

Pace = 50 ÷ 10 = 5.00 min/km

Speed = 10 ÷ (50 ÷ 60) = 10 ÷ 0.8333 = 12.00 km/h

So a 50-minute 10K means you ran at 5:00 per kilometer, or 12 km/h average.

When to Use This

Use this calculator any time you finish a run, bike ride, or walk and want to know your average pace or speed. It’s especially useful for setting training targets: if you want to run a 10K in under 50 minutes, you know you need to hold at least 5:00 min/km. The same math works for any distance—5K, half marathon, marathon—as long as you enter the correct distance and total time.

How to Read the Result

The pace number tells you how many minutes each kilometer took. A lower pace means faster running. The speed number is the equivalent average speed in kilometers per hour. Many runners think in pace, while cyclists and drivers think in speed; both are shown so you can use whichever is familiar.

Note that pace and speed are reciprocals but not exact inverses because of the 60-minute hour conversion. For example, 5 min/km equals 12 km/h exactly, but 6 min/km equals 10 km/h, not 10.0. The calculator rounds to two decimals, which is precise enough for training.

Common Mistakes

• Mixing units: If you run in miles, convert to kilometers first (1 mile = 1.60934 km). Entering miles as km will give a pace that looks too fast.
• Using seconds instead of minutes: If your finish time is 50 minutes and 30 seconds, enter 50.5, not 50.30.
• Rounding too early: Keep full precision during the calculation; round only the final result to two decimals.
• Confusing pace and speed: A faster runner has a lower pace and a higher speed. If your result seems off, check which one you’re looking at.

Limits of the Formula

This formula assumes a constant pace throughout the entire distance. In reality, most runners slow down or speed up, so the result is an average, not a split-by-split prediction. It also ignores elevation changes, terrain, and stops. For a hilly route, your average pace will be slower than on a flat course even if your effort is the same.

The formula is purely arithmetic—it doesn’t account for heart rate, weather, or fatigue. Use it as a planning tool, not a precise predictor of race performance.

Frequently Asked Questions

What is a good pace for a beginner?

A common beginner 5K pace is around 6:30–7:30 min/km (8–9.2 km/h). But “good� depends on age, fitness, and experience. Instead of comparing to others, use this calculator to track your own improvement over time.

How do I convert pace to speed?

Divide 60 by your pace in minutes per kilometer. For example, 5 min/km = 60 ÷ 5 = 12 km/h. This calculator does that for you automatically.

Should I use pace or speed on my watch?

Most runners prefer pace because it directly relates to effort per distance. Cyclists and walkers often prefer speed. Use whichever feels intuitive; both are valid.

Does this work for treadmill runs?

Yes, if you enter the distance the treadmill shows and the time you ran. Treadmills may be slightly inaccurate, so for precise training, use a calibrated device or track.

How accurate is this for a marathon?

It gives your average pace and speed across the full distance. If you run a negative split (faster second half), your average will be between your two halves. The formula itself is exact; the limitation is that you rarely run at a perfectly constant pace.

Can I use this for walking?

Absolutely. Enter your walking time and distance. Typical walking pace is 10–15 min/km (4–6 km/h). The calculator works the same way.

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in t | Finish time | min | 50 | 0
in d | Distance | km | 10 | 0
out pace | Average pace | min/km | t / d | 2
out speed | Average speed | km/h | d / (t / 60) | 2